Re: [PATCH] libata-core More robust parsing for multi_count(v5)

[Mark Lord <liml@rtr.ca>]

Alan Cox wrote:
>> Oh, and zero means "don't care".  So it's really easy to add
>> to libata without having to patch each and every driver.
> 
> If its only one driver why not do it the way we do things like transfer
> length limits for LBA48 (see pata_it821x and others)
..

Thanks.  I'll do that, and probably go that way for the sata_mv limit.

The bigger issue here is that libata really doesn't support multiple mode.

Sure, it will blindly use it if the drive appears to be already configured
for it at startup.  But I don't see any where that we issue "SET MULTIPLE"
commands or otherwise support turning it on/off or tuning it.

I wonder if we even snoop the SET MULTIPLE command from SG_IO / ATA_{12,16}?

This is more of an infrastructure thing than a driver-specific setting,
so I'm hoping that one of you three (who know the code a lot better
than I do) might think about that for the future.

Thanks again.